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Szczerbowski D, Schulz S, Zarbin PHG. Total synthesis of four stereoisomers of methyl 4,8,12-trimethylpentadecanoate, a major component of the sex pheromone of the stink bug Edessa meditabunda. Org Biomol Chem 2021; 18:5034-5044. [PMID: 32573631 DOI: 10.1039/d0ob00862a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The male-produced sex pheromone of the stink bug Edessa meditabunda was previously identified as a mixture of the esters methyl 4,8,12-trimethylpentadecanoate (1) and methyl 4,8,12-trimethyltetradecanoate (2), produced in a ratio of 92 : 8, respectively. Bioassays showed that the synthetic major compound alone is sufficient to elicit a response from females, and that it is as attractive as the natural extract. Here we present a stereoselective synthesis of four stereoisomers of methyl 4,8,12-trimethylpentadecanoate. The synthetic route was based on the connection of three chiral building blocks. High stereoisomeric purity was achieved by using commercially available compounds with defined stereochemistry, (R) and (S)-citronellol and methyl (S)-3-hydroxy-2-methylpropionate. Different stereoisomers were synthesized by swapping the sequence in which the building blocks were inserted into the synthetic route. The key steps in the synthesis were coupling reactions using the Fouquet-Schlosser variant of the Grignard reaction. Although the absolute configuration of the natural product remained elusive due to chromatographic inseparability of the stereoisomers, the syntheses gave access to both enantiomers of the biosynthetically most likely stereoisomer syn,syn-1, while all other stereoisomers can be efficiently synthesized by our straightforward approach.
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Affiliation(s)
- Daiane Szczerbowski
- Laboratório de Semioquímicos, Chemistry Department, Federal University of Paraná, 81531-990 Curitiba, Brazil. and Institute of Organic Chemistry, Technische Universität Braunschweig, 38106 Braunschweig, Germany
| | - Stefan Schulz
- Institute of Organic Chemistry, Technische Universität Braunschweig, 38106 Braunschweig, Germany
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Wallin EA, Kalinová B, Kindl J, Hedenström E, Valterová I. Stereochemistry of two pheromonal components of the bumblebee wax moth, Aphomia sociella. Sci Rep 2020; 10:2094. [PMID: 32034275 PMCID: PMC7005912 DOI: 10.1038/s41598-020-59069-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 01/24/2020] [Indexed: 12/02/2022] Open
Abstract
The bumblebee wax moth, Aphomia sociella, is a parasite of bumblebees. In this species, males produce sexual pheromone to attract females, while females produce an aphrodisiac pheromone that initiates male courtship. Both pheromones contain 6,10,14-trimethylpentadecan-2-one (TMPD-one) and the corresponding alcohol, 6,10,14-trimethylpentadecan-2-ol (TMPD-ol) in sex specific quantities. Male sex pheromone consists of 7 components with TMPD-one as a minor one and traces of TMPD-ol. In female aphrodisiac pheromone, TMPD-ol is the major component, while TMPD-one is present in traces. Here we report on the absolute configuration of TMPD-one in male sex pheromone and TMPD-ol in female aphrodisiac pheromone of A. sociella. The configuration was determined from GC/MS of prepared (S)-acetoxypropionyl esters of TMPD-ol. TMPD-one was first reduced to the alcohol that was then derivatized with (S)-acetoxypropionyl chloride. The GC/MS data of obtained diastereoisomers were compared with synthetic standards. The absolute configuration of TMPD-one in the male pheromone was (6R,10R). The configuration of TMPD-ol in the female pheromone was (2R,6R,10R). Electrophysiological experiments showed that TMPD-one and TMPD-ol are perceived by both sexes. The synthetic standards of naturally produced stereoisomers elicited higher responses than mixtures of all stereoisomers.
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Affiliation(s)
- Erika A Wallin
- Mid Sweden University, Department of Chemical Engineering, SE-851 70, Sundsvall, Sweden
| | - Blanka Kalinová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Research Group of Infochemicals, 166 10, Prague, Czech Republic.,Faculty of Forestry and Wood Sciences, Extemit-K group, Czech University of Life Sciences, 165 21, Prague, Czech Republic
| | - Jiří Kindl
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Research Group of Infochemicals, 166 10, Prague, Czech Republic.,Faculty of Forestry and Wood Sciences, Department of Forest Protection and Entomology, Czech University of Life Sciences, 165 21, Prague, Czech Republic
| | - Erik Hedenström
- Mid Sweden University, Department of Chemical Engineering, SE-851 70, Sundsvall, Sweden
| | - Irena Valterová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Research Group of Infochemicals, 166 10, Prague, Czech Republic. .,Faculty of Tropical AgriSciences, Department of Crop Sciences and Agroforestry, Czech University of Life Sciences, 165 21, Prague, Czech Republic.
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Hedenström E, Wallin EA, Andersson J, Bång J, Wang HL, Löfstedt C, Brattström O, Baquet P. Stereoisomeric Analysis of 6,10,14-Trimethylpentadecan-2-ol and the Corresponding Ketone in Wing Extracts from African Bicyclus Butterfly Species. J Chem Ecol 2014; 41:44-51. [DOI: 10.1007/s10886-014-0539-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 10/28/2014] [Accepted: 11/12/2014] [Indexed: 10/24/2022]
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